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Ureteral stents are often used in urology for obstruction and stenosis caused by various reasons. The ureteral stent tube is often called "double J tube" because its two ends curl like the English word "J". It is also called "pig tail tube" because its two ends look like pigtails. As shown in the above figure, the ureteral stent is generally placed at one end in the kidney, the other end in the bladder, and the middle passes through the ureter.
Generally speaking, ureteral stents can be implanted through kidney or urinary tract. The following is an example of ureteral stents implantation in the case of urinary calculi through urinary tract.
For stones with a diameter of less than 1cm, if the renal function is normal and there is no urinary obstruction, extracorporeal shock wave lithotripsy can be carried out with a lithotriptor, or removed or crushed through endoscopy (such as nephroscope, ureteroscopy, etc.). There is no need to place the ureteral stents routinely. For some patients with ureteral obstruction caused by stones and infection, which are not suitable for operation temporarily, stent placement and drainage can be given. After the infection is controlled, elective surgery and lithotripsy can be performed.
The specific operations can be as follows:
1. Firstly, with the help of ureteroscope, find the corresponding ureteral opening, insert the ureteral catheter (Fig. 1), and inject contrast-enhanced agent (retrograde urography) to further clarify the size of stone and site, etc.
2. Insert the guide wire. The head end of the guide wire needs to pass through the stone and the tip reaches the renal pelvis (Fig. 2).
3. Insert the ureteral stent and withdraw the guide wire. The upper end of the ureteral stent is located in the renal pelvis and restores its natural pig tail shape (Fig. 3) after withdraw of guide wire.
4. After the operation, urography can be done. The ureteral stent is made of X-ray impermeable material. The X-ray film after the radiography can clearly show the position and shape of the ureteral stent (Fig. 4). The follow-up treatment can be lithotripsy, stone removal or other treatment according to the treatment plan.
In addition to stones, ureteral stents can also be used for ureteral stenosis and obstruction caused by other reasons, including tumor of urinary system itself, fibrous hyperplasia and exogenous compression.
For the placement of ureteral stent through renal pathway, the channel can be established for patients with renal calculi or hydronephrosis with the help of percutaneous renal dilation Kit. This method has the advantages of simple operation, less trauma and safety. It can be carried out in hospitals at all levels.
The placement time of ureteral stent is determined according to the needs of the patient's condition. Generally, it is placed for 2 weeks to 3 months and can be taken out through urethra under cystoscopy or ureteroscopy, as shown in the following figure (Figure 5):
SCW MEDICATH LTD, established in 1996 and headquartered in Shenzhen, is the first factory to develop and manufacture Central Venous Catheters， Blood pressure Transducer, and many other products in China. As a professional medical manufacturer, SCW has specialized in Intervention, Anesthesiology & Critical Care, Obstetrics & Gynecology, Urology, Medical Imaging, Orthopedics, and other high-value medical consumables. At present, more than 60 domestic registered products and more than 30 CE certified products. SCW is certified by ISO13485 Quality System Certificate and CE Certificate. SCW products are sold across China and exported to over 80 countries and regions. For more information about Ureteral Stent, please do not hesitate to contact us.
